ROBERT K SMITH
Radio and Television Technicians in Wilmington, MA

4266166, May 5, 1981

Nov 9, 1979

6/092914

Joseph M. Proud - Wellesley Hills MA
Robert K. Smith - Wilmington MA

GTE Laboratories Incorporated - Waltham MA

H05B 4116, H05B 4124

315248

Light source wherein high frequency power is capacitively coupled to a low pressure discharge includes at least one metallized power coupling conductor. A discharge lamp includes an envelope which is typically pear-shaped with a re-entrant cavity. The lamp envelope encloses a fill material which forms during discharge a plasma which emits ultravoilet radiation and typically includes on its inner surface a phosphor coating. An outer conductor is disposed around the outer surface of the lamp envelope. A conductive coating disposed on the inner surface of the re-entrant cavity forms the inner conductor. The outer conductor can be a conductive mesh or can be a conductive coating disposed on the outer surface of the lamp envelope in a pattern which permits light to escape from the lamp. When the conductive coating of the inner conductor is substantially more than one skin depth in thickness at the frequency of operation, the re-entrant cavity is substantially field-free and can be used to house power source circuitry. When the conductive coating of the outer conductor is substantially more than one skin depth in thickness at the frequency of operation, the light source is prevented from radiating high frequency power.

6016031, Jan 18, 2000

Aug 11, 1997

8/909323

Walter P. Lapatovich - Boxford MA
Gerhard W. Doell - Beverly MA
Robert K. Smith - Wilmington MA

Osram Sylvania Inc. - Danvers MA

H01J 162, H01J 6304, H01J 1716, H01J 6130

313493

An Electrodeless High Intensity Discharge (EHID) lamp for projection applications. The lamp has a small (nominal dimensions: 2 mm I. D. , 3 mm O. D. , 6 mm internal length) capsule, which is constricted in a mid-portion thereof. The constriction squeezes the plasma within the capsule and provides a higher power density. This in turn produces a higher luminance in the center of the arc. This focal point of the projection system is constant over the life of the lamp, owing to the fact that the system is electrodeless. The arc tube or capsule is thickened in the vicinity of the constriction to permit heat transfer through the vitreous silica (commonly called quartz). The thickening carries the heat away from the now hotter mid-portion area. This thickening cools by virtue of increasing the thermal conduction through the glass.

4427925, Jan 24, 1984

Nov 18, 1981

6/322491

Joseph M. Proud - Wellesley Hills MA
Robert K. Smith - Wilmington MA
Charles N. Fallier - Westford MA

GTE Laboratories Incorporated - Waltham MA

H05B 4116, H05B 4124

315248

An electromagnetic discharge apparatus including an electrodeless lamp containing a fill material which emits light when subjected to a high frequency electric field. The lamp envelope is generally cylindrical. Power is coupled to the contents of the lamp by electrodes which encircle each end of the envelope and are spaced apart in the central region of the envelope to provide a capacitive gap between them. An inner coaxial conductor is connected to one of the electrodes and an outer conductor is connected to the other electrode by way of a conductive shielding member which encircles the lamp and the electrodes. A heating arrangement may be provided to maintain the temperature and thus the pressure of the fill material within the envelope constant.

4427920, Jan 24, 1984

Oct 1, 1981

6/307418

Joseph M. Proud - Wellesley Hills MA
Robert K. Smith - Wilmington MA
Charles N. Fallier - Westford MA

GTE Laboratories Incorporated - Waltham MA

H05B 4116, H05B 4124

315248

An electromagnetic discharge apparatus including an electrodeless lamp containing a fill material which emit light when subjected to a high frequency electric field. Power is coupled to the contents of the lamp by a coupling fixture having an outer conductor of conductive mesh and an inner conductor. The electrodeless lamp is mounted between two electrodes, one from the inner conductor and one from the outer conductor which terminate closely adjacent to opposite outer surfaces of the electrodeless lamp.

5339008, Aug 16, 1994

Apr 13, 1993

8/046694

Walter P. Lapatovich - Marlborough MA
Scott J. Butler - North Oxford MA
Robert K. Smith - Wilmington MA

Osram Sylvania Inc. - Danvers MA

H05B 4126

315248

An electromagnetic discharge apparatus including a solid state supply or lamp ballast for energizing an electrodeless high intensity discharge (HID) lamp in a dual-ended fashion. A low power signal from a high frequency oscillator is split into two separate signals with definite phase relationship which are coupled to separate power amplifiers. In one embodiment, the signal from the high frequency oscillator is mixed with a signal from a modulation oscillator to AM, FM or pulse-width (PWM) modulate the power delivered to the lamp. This technique permits better control over the balance of power delivered to the ends of the lamp.